/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile;

import proguard.classfile.attribute.Attribute;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.visitor.*;

/**
 * Representation of a method from a program class.
 *
 * @author Eric Lafortune
 */
public class ProgramMethod extends ProgramMember implements Method {
    private static final Attribute[] EMPTY_ATTRIBUTES = new Attribute[0];

    /**
     * An extra field containing all the classes referenced in the descriptor string. This field is filled out by the
     * {@link proguard.classfile.util.ClassReferenceInitializer ClassReferenceInitializer}. The size of the array is the
     * number of classes in the descriptor. Primitive types and arrays of primitive types are ignored. Unknown classes
     * are represented as null values.
     */
    public Clazz[] referencedClasses;

    /**
     * Creates an uninitialized ProgramMethod.
     */
    public ProgramMethod() {}

    /**
     * Creates an initialized ProgramMethod without attributes.
     */
    public ProgramMethod(int u2accessFlags, int u2nameIndex, int u2descriptorIndex, Clazz[] referencedClasses) {
        this(u2accessFlags, u2nameIndex, u2descriptorIndex, 0, EMPTY_ATTRIBUTES, referencedClasses);
    }

    /**
     * Creates an initialized ProgramMethod.
     */
    public ProgramMethod(int u2accessFlags, int u2nameIndex, int u2descriptorIndex, int u2attributesCount,
        Attribute[] attributes, Clazz[] referencedClasses) {
        super(u2accessFlags, u2nameIndex, u2descriptorIndex, u2attributesCount, attributes);

        this.referencedClasses = referencedClasses;
    }

    // Implementations for ProgramMember.

    public void accept(ProgramClass programClass, MemberVisitor memberVisitor) {
        memberVisitor.visitProgramMethod(programClass, this);
    }

    public void attributesAccept(ProgramClass programClass, AttributeVisitor attributeVisitor) {
        for (int index = 0; index < u2attributesCount; index++) {
            attributes[index].accept(programClass, this, attributeVisitor);
        }
    }

    // Implementations for Member.

    public void referencedClassesAccept(ClassVisitor classVisitor) {
        if (referencedClasses != null) {
            for (int index = 0; index < referencedClasses.length; index++) {
                if (referencedClasses[index] != null) {
                    referencedClasses[index].accept(classVisitor);
                }
            }
        }
    }
}
